Mom Frame
thingiverse
I was inspired by another stl found here which was a heart frame our of Love. So I made a mother's day one. It fits a 65x65 heart lithophane from lithophanemakers.com. A great site. It just requires a little sanding to get it to fit snug.
Download Model from thingiverse
With this file you will be able to print Mom Frame with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Mom Frame.